A simple stylized diagram of the refrigeration cycle: 1) condensing coil, 2) expansion valve, 3) evaporator coil, 4) compressor.The external section of a typical single-room air conditioning unit. For ease of installation, these are frequently placed in a window. This one was installed through a hole cut in the wall.
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Central Air, Heat Pump Sytems

An air conditioner is an appliance, system, or mechanism designed to extract heat from an area using a refrigeration cycle. In construction, a complete system of heating, ventilation, and air conditioning is referred to as HVAC. more...

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Its purpose, in the home or in the car, is to provide comfort during hot days and nights.

History

See Air conditioning#History.

Air conditioning applications

See Air conditioning#Air conditioning applications.

Air conditioning system basics and theories

Refrigeration cycle

In the refrigeration cycle, a heat pump transfers heat from a lower temperature heat source into a higher temperature heat sink. Heat would naturally flow in the opposite direction. This is the most common type of air conditioning. A refrigerator works in much the same way, as it pumps the heat out of the interior into the room in which it stands.

This cycle takes advantage of the universal gas law PV = nRT, where P is pressure, V is volume, R is the universal gas constant, T is temperature, and n is the number of moles of gas (1 mole = 6.022×1023 molecules).

The most common refrigeration cycle uses an electric motor to drive a compressor. In an automobile the compressor is driven by a pulley on the engine's crankshaft, with both using electric motors for air circulation. Since evaporation occurs when heat is absorbed, and condensation occurs when heat is released, air conditioners are designed to use a compressor to cause pressure changes between two compartments, and actively pump a refrigerant around. A refrigerant is pumped into the cooled compartment (the evaporator coil), where the low pressure and low temperature cause the refrigerant to evaporate into a vapor, taking heat with it. In the other compartment (the condenser), the refrigerant vapour is compressed and forced through another heat exchange coil, condensing into a liquid, rejecting the heat previously absorbed from the cooled space.

Humidity

Refrigeration air conditioning equipment usually reduces the humidity of the air processed by the system. The relatively cold (below the dewpoint) evaporator coil condenses water vapor from the processed air, (much like an ice cold drink will condense water on the outside of a glass), sending the water to a drain and removing water vapor from the cooled space and lowering the relative humidity. Since humans perspire to provide natural cooling by the evaporation of perspiration from the skin, drier air (up to a point) improves the comfort provided. The comfort air conditioner is designed to create a 40% to 60% relative humidity in the occupied space. In food retailing establishments large open chiller cabinets act as highly effective air dehumidifying units.

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Aircon 24,000 btu ductless mini split Heat Pump $1,089.00 1.5 Ton Air Conditioner Conditioning Condition A/C Ac $1,034.00
Qty 40 Aircon 24,000 btu ductless mini split Heat Pumps $34,000.00 Goodman 4 Ton Air Conditioning Ac Cooling Packaged 13Sr $1,388.00
Goodman 3 Ton 14Seer Air Conditioning Ac Cooling $ave $1,549.00 Goodman 3 Ton 13Seer Air Conditioning Ac Cooling Add On $939.00
Goodman 3Ton 13Seer Air Conditioning Ac Cooling Central $1,179.00 Bryant 4 Ton 13 Seer Package Unit New 15 Kw Heat $2,199.00
Universal A/C Remote Control 100Es for Air Condition $3.19 Ducane Heat Pump Air Conditioner Cental Air Hp10B36 $500.00
Air Conditioner Ac Infrared Ir Remote Control Rc Mini $3.99 Goodman 80% 70K Btu Gas Furnace + 1 1/2 Ton 13 Seer A/C $1,365.00
Armstrong 2 ton central air conditioner condenser used $49.99 Goodman 80% 90K Btu Gas Furnace + 4 Ton 13 Seer A/C $1,889.00
Goodman 80% 115K Btu Gas Furnace 3 1/2 Ton 13 Seer A/C $1,789.00 Goodman 95% 115K Btu Gas Furnace + 5 Ton 13 Seer A/C $2,344.00
Goodman Central 13 Seer A/C Air Conditioner Gsc130361 $99.99 Goodman 2 Ton 13 Seer Heat Pump Split System $1,358.00
Trane Central Air Condition Unit A/C 2Ttb3018A1000A $99.99 Mini Lcd Universal A/C Remote Control for Air Condition $1.99
5 Ton Central Air & Heat System Installed! ac & furnace $5,099.00 Carrier Rooftop Packaged Air Conditioner A/C Heater 3Ph $899.99
Jandy Titanium Heat Exchanger Air Energy Heat Pump 135K $2,499.99 Round Central Air Conditioner Cover $9.55
Goodman Air Conditioner 13 Seer Condenser A/C 4 Ton $102.50 Goodman 4 Ton Air Conditioner A/C Condenser 13 Seer $89.00
New Complete System Condenser Air Handler with Coil $1,073.00 Amcor Duo 12000 Btu Ductless Split Air Cond & Heat $749.99
Air Conditioner Contactor, 24 volt, 2 pole, 60 amp $99.00 Air Conditioner Fan relay, 24 volt coil, Dbdt $39.95
Air Conditioner Fan relay, 24 volt coil, Spno, Spnc $29.95 30+5, 35+5, 40+5, 45+5 uf Mfd Dual Run Capacitor A/C $7.99
aerovox capacitor 5uf 370 volts 60hz Used! $1.00 Rheem 3 ton air handler for heat pump 10,11,12,13 Seer $9.99
New Central Air Conditioner Cover 24" by 24" by 24" !!! $34.99 Payne Air Conditioner Condenser w/ Cover & Concrete Pad $49.99
Unitary Products Group, Heat Strip Kit For Air Handler $24.99 Air Conditioner Cover...36" $14.95
Goodman 13 Seer 5 Ton Condenser W/ Electric Air Handler $2,175.00 Trane Axiom Gevb Heat Pump 3 ton New with warranty $549.00
Goodman 13 Seer 2.5 Ton Condenser w/2.5 Ton Air Handler $1,450.00 Goodman 14 Seer 3.5 Ton Cond. w/ Var.Speed Air Handler $2,095.00
Goodman 14 Seer 3.5 Ton Heat Pump Cond. w/ Air Handler $2,349.00 Reduced New Carrier 3-ton 21 seer Infinity Complete $4,498.89
Brand New--Great Quality-- Cheap Evaporator Coils $165.00 Air Conditioning Heat Pump Lennox 3 Ton Outdoor Section $299.00
Humidifier-High Capacity for 95% Gas Furnace 120 Volt $395.00 High Capacity Humidifier for 95% Gas Furnace $425.00
High Capacity Humidifier for 80% Gas/Oil Furnace $425.00 Humidifier for 3.0, 3.5, 4.0, 5.0 Ton Heat Pumps $425.00
Humidifier for 1.5, 2.0, 2.5, 3.0 Ton Heat Pumps $425.00 Heat Pump Crank Case Heaters Nib $15.00
New 13 Seer Heat Pump Air Conditioner Condensing Unit $932.00 Daikin Vrvii Inverter R410A Outdoor Condensor 8 Ton New $2,999.99
5Kw Heat Strip for Coleman, York, Central Ac, 4Hk Kit. $20.00 5 Ton Heat Pump Central Air Bryant New In Box Puron $999.00
York 4 Ton Gas/Electric Package Unit 13 Seer R-22 $3,050.00 York 3.5 Ton Heat Pump Package Unit 13 Seer R-22 $2,950.00
Rheem 15 Ton Air Conditioner Model Rawe-181Caz $2,000.00 3.5 Ton or 4 Ton Puron Central Air Condition New In Box $699.00
Nordyne 3 1/2 Ton 10 Seer Ac Coil, "A" configuration $350.00 **Diversitech Condensate Pump/Hvac Pump Cp-22T** $31.50
Haier 10 Seer 4 Ton (48,000) Btu Heat Pump A/C $649.00 Goodman 4.0 Ton 14 Seer Central Heat Pump Ac A/C Hp $2,225.00
3 Ton Air Conditioner Conditioning A/C Ac Heat Pump $1,722.00 Goodman Heat Pump Compressor Air Conditioning Ac Unit $499.99
Rheem 4 Ton Air Only Package Unit Commercial $1,400.00 Cool-N-Save Air Conditioner Mister $89.99
Protective Cages A/C Unit Condenser HeatPump Security $270.00 6 Ton Climatemaster Tranquility 27 Package $10,300.00
Nib Haier 3.5 Ton/10 Seer Air/Heat Pump System 42000btu $750.00 Copeland Scroll Compressor 4 Ton 220Vac 1Phase Zr47K3 $750.00
Coleman Brcs0361Bd Central Air Conditioner $86.00 Rheem A/C Evaporator Coil $5.50
New Goodman Air Handler 2 Ton $50.00 New Goodman® 5 ton 13 Seer Packaged Air Conditioner $1,999.00
Trane 3 ton Central Air Conditioner R-22 Used 1 Season $56.55 3 Ton 13 Seer Central Air Conditioner Add On $1,287.00
Custom Made Air Conditioner Covers For the Winter $80.00 Fedders 5 Ton A/C & 115K Btu Gas Furnace Package $2,333.00
Fedders 2.5 Ton A/C & 70K or 85K Btu Furnace Package $1,663.00 Brand New Goodman 3.5 Ton Central Air Condition Unit $1,949.00
Fedders 3 Ton A/C & 85K or 100K Btu Gas Furnace Package $1,803.00 Mitsubishi Ductless Air Conditioner 1.5 ton 18,000 Btu $599.99
Toshiba Air Conditioner Remote Control Ras-M16Smucv-E $14.99 Amana 5 ton 18 seer Two Stage Heat Pump Asz180601A $4,666.00
Goodman 5 ton Heat Pump System R-410A Gsz130601A $2,393.00 Goodman 3-1/2 ton Heat Pump System R-410A Gsz130421A $1,888.00
Goodman 2-1/2 ton 13 seer Heat Pump System Brand New $1,499.00 Amana 2-1/2 ton 15 seer Heat Pump system, Asz140301A $2,443.00
Amana 3 ton 15 seer Heat Pump system, Asz140361A $2,818.00 Amana 70k Two Stage 95% Gas Furnace 2 Ton 13 Seer A/C $2,009.00
Goodman Gsc13 - 018 $500.00 New Goodman A/C Central Air Condenser 10Yr Warranty $739.00
Complete Heat Pump Package 13 Seer 2 Ton Energy Star$$$ $1,489.00 Complete Heat/Air Package 13 Seer 2 Ton Energy Star A/C $1,259.00
Brand New Trane Central Unit Air Conditioner R-22 Nr $995.00 Ge 60A Air Conditioner Disconnect $9.99
Ruud Rheem 2-ton air conditioner condenser 16 Seer $255.00 York Air Conditioner Evaporator H5Db048 New $100.00
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Prices current as of last update, 08/28/08 8:03pm.
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